Mnemonic Betrayal [Guilds of Ravnica] Urza's Mine Its scales contain the essence

Its scales contain the essence of thousands of lotus blooms

Set: Eighth Edition Type: Artifact Rarity: Rare Cost: {5} Each creature gets +1/+1 for each other creature on the battlefield that shares at least one creature type with it

counter that spell

you may sacrifice a creature

Set: Kaladesh Prerelease Promos Type: Artifact Creature — Construct Rarity: Mythic Cost: {4}{R}{R} First strike

Mnemonic Betrayal [Guilds of Ravnica] Urza's Mine Its scales contain the essenceSet: Guilds of Ravnica Type: Sorcery Rarity: Mythic Cost: {1}{U}{B} Exile all opponents' graveyards. You may cast spells from among those cards this turn, and you may spend mana as though it were mana of any type to cast those spells. At the beginning of the next end step, if any of those cards remain exiled, return them to their owners' graveyards. Exile Mnemonic Betrayal.